323

This number is a composite.

+ The smallest palindrome whose factors are twin primes (17 * 19). [Russo]

+ 323 doubled up (i.e., 323323) has five consecutive prime factors which when squared and summed, yield 989, another palindrome! [De Geest]

+ 323 is the smallest Lucas pseudoprime. [Terr]

+ The smallest brilliant Honaker number. [Gaydos]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell